#include <iostream>

 #include <stdio.h>

 #include <cstring>

 using namespace std;

 int a[]={, , , , , , , , , , , , };

 int b[]={, , , , , , , , , , , , };

 char c[][]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};

 int panduan(int y)

 {

     if((y%== && y%!=) || y%==)

         return ;

     return ;

 }

 int main()

 {

    int y, m, d, sum, i;

    while(cin>>y>>m>>d)

    {

       if(panduan(y))

       {

           if(d>b[m]||m==||d==)

             {

                 cout << "illegal" << endl;

                 continue;

             }

       }

       else

         {

             if(d>a[m]||m==||d==)

             {

                 cout << "illegal" << endl;

                 continue;

             }

         }

         sum=;

         for (i=; i<y; ++i)

             {

                if(panduan(i))

                 sum += ;

                else

                 sum += ;

             }

         for(int i = ; i < m; ++i)

         {

             if(panduan(y))

                 sum += b[i];

             else

                 sum += a[i];

         }

         sum+=d;

         sum%=;

         cout<< c[sum] << endl;

    }

    return ;

 }